Question on oversized protective clothing.

Hello dear forum. I have a few questions about protective clothing. I’m thinking about making the new B196 driver’s license. Now I’ve found a driving school where I can take motorcycle trial lessons without signing a contract. There’s a problem, however. There’s no protective clothing in my size and without protective clothing you can’t drive there. So now I went to the city with a buddy to buy protective clothing. Now it’s like that. I have a few grams of overweight and I knew it wouldn’t be that easy with pants. But now it was like that even the biggest pants in size 33 didn’t fit. Now I wanted to know: Can you make protective clothing bigger? Does the protective clothing have to comply with any standards? I didn’t necessarily want to buy a tailor-made protective clothing for thousands of euros now, just to find out if it’s what for me. What do you say as an experienced motorcycle drivers? Thank you for your answers in advance. MfG M_nds